what is order of Root raise Cosine filter mention below and how can order of RRC Filter can be adjusted according to requirements?

rolloff = 0.25; % Rolloff factor span = 6; % Filter span in symbols sps = 4; % Samples per symbol rrcFilter = rcosdesign(rolloff, span, sps); txSig = upfirdn(modData, rrcFilter, sps); EbNo = 7; snr = EbNo + 10*log10(k) - 10*log10(sps); rxSig = awgn(txSig, snr, 'measured'); rxFilt = upfirdn(rxSig, rrcFilter, 1, sps); rxFilt = rxFilt(span+1:end-span);